tacit consent vs connivance

tacit consent and connivance both are nouns.

Word	Noun	Adjective	Verb	Adverb
tacit consent	Yes	No	No	No
connivance	Yes	No	No	No

As nouns, tacit consent and connivance are synonyms defined as:

tacit consent and connivance: (law) tacit approval of someone's wrongdoing

Other synonyms of tacit consent include secret approval.

tacit consent (noun)	connivance (noun)
(law) tacit approval of someone's wrongdoing	agreement on a secret plot
	(law) tacit approval of someone's wrongdoing